Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b171f4c4baaab9b…

MALICIOUS

PDF

74.3 KB Created: 2021-08-12 03:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a1c2df3b66637359c0fe79f7d9855821 SHA-1: ae91f31de926e05dae72a9d54fe39b927c0b7df3 SHA-256: 5b171f4c4baaab9beefb28f81ebb5173e45ec35a3cc79deefb35fa69537ead31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef3d34d63---55105536750.pdf In PDF document text
    • https://liniagdanskzydowo.pl/files/tasobojedasu.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/80485693210.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jugunuwo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160828c29b8d67---84032815939.pdfIn PDF document text
    • https://kermanrooz.com/img/files/51397284667.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/6710595719.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/75222149225.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1611340f6e46e9---sufonabimuxezijo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcbe0d1e3---58752034956.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/kamesirane.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/67432a686e654227a1464bd7bec73243/worabetuvakipuvekupimusi.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/narir.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/nufebazoxa.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/89912598470.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/629adecddc102dcb54342b81718eee92/fuxokasogigiw.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/vadesidijupedokun.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/41132458766.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wuzujivikun.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5a0e5a4aee137b237f8fed870690ded7/8746322043.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b62614d44d9cf329799aa9152b8bb57a/larosolemaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=statistics+informed+decisions+using+data+4th+edition+%28+pdf+-+version+%29PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD18 11532 bytes
SHA-256: 48cc1b4b5f0583e6d72a69c7a6dfc8bcc7450f1b5456ca1f23cdaa5c75a1316a
font_01_sfnt_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 16372 bytes
SHA-256: b3cdb24a3bc1860b18d957512e3cffda1a2e4c67c70e09b8bbc21c7391845de6